Electric temperature-indicator.



Patented Oct. 23, I900.

s. WILDER. ELECTRIC TEMPERATURE mmcnon.

(No Iodol.)

(Apphcatxon filed Feb 17 1900) WZQJZY/ UNITED STATES PATENT ()FEICE.

LESLIE S. WILDER, OF SPRINGFIELD, MASSACHUSETTS.

ELECTRIC TEM PERATURE-INDICATOR.

SPECIFICATION forming part of Letters Patent No. 660,352, dated October 23, 1900.

Application filed February 17, 1900. Serial No. 5,563. (No model.)

To all whom it. may concern:

Be it known that I, LESLIE S. VVILDER, a citizen of the United States of America, and a resident of Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Electric Temperat'ure-Indicators, of which the following is a full, clear, and exact description.

This invention relates to improvements in temperature-indicators of the class in which a thermostat affected by the temperature conditions closes a normally-open electric circuit and thereby insures the operation of an alarm device or audible or other description of indicator which is connected in electric circuit and operating by the current established therethrough.

The present device is especially designed for use in hospitals, the audible indicator sounding upon the rising of the temperature a few degrees above the normal or falling therebelow.

The purposes of this invention are to produce a simple, practical, and efficient indicator of the general class indicated, and, furthermore, to produce one which is most readily adaptable or adjustable, so as to be operative to sound the indicator within any desired range of temperature change, and which, moreover, is compact and self-contained and portable, so that the apparatus entire may be placed anywhere desired in the room or suitably remote therefrom, as occasion my render desirable.

The invention consists in the combination or arrangement of devices and the construc tion thereof, all substantially as hereinafter described, and set forth in the claim.

Reference is to be had to the accompanying drawings, in which- Figure 1 is a plan view of the temperatureindicator, certain parts being broken away for the disclosure of underlying parts for the purposes of clearer illustration. Fig. 2 is a vertical longitudinal section taken on the line 2 2, Fig. 1.

In the drawings, A represents a support on which is screwed the brass or other metallic plate B. The said support A may advantageously be made of wood, and, as shown, con stitutes the cover of a box or cabinet A At one end of the plate B is riveted or otherwise secured the extremity of a U-shaped metallic part 0, screwed or riveted on the upper approximately horizontally extending free end of which is the thermostat-bar D. This bar is composed, as common in this class of appliances, of two or more materials, those shown being a thin metallic strip of metal a and a superimposed thickness of hard rubber or gutta-percha b. These materials are united in any suitable manner, rivet-s d 61 being shown. At the opposite end of the base-plate B from the U-shaped rising part 0 is a riser or upright E, the extremity of which, as indicated at f, is of U shape, between the separated members of which the extended end portion of the metallic layer a of the thermostatbar is extended. The base of the upright E is by the layer 9 of suitable material insulated from the base, and consequently from the part 0 in metallic connection with the base and on which part the thermostat-bar is mounted. Through the opposite portion of the U-shaped extremity of the upright E screw the threaded contacts h and h the approached ends of which may be comparatively close to the normal position of the extremity of a or considerably distant therefrom. The screw t has its shank passed loosely through the thermostat bar and through the hole 6 therefor in the U-shaped part O and passes with a screw engagement into the base-support thereunder, the head of this screw overlying and engaging the top of the thermostat-bar. By turning the screw the bar as a whole may be adjusted, and this capability of adjustment,together with the adjustable contacts h and 7t2 at the opposite end of the apparatus, renders the same adaptable with great nicety to fulfil the purposes for which it is intended under all circumstances.

G represents a battery.

on and n represent binding-posts.

H represents a switch having the contactj and the movable or switching contactj J represents an audible electric indicator or buzzer which in itself com prises no novelty, the same embodying electromagnet and armature and a spring make-and-break device, as common.

From one pole of the battery the wire 10 runs to the binding-post 12, which is in elec trical connection with the electromagnet. From another binding-post 13, which is also in electrical connection with the electromagnet, the wire letruns to connection with the movable switch member 3' and from the contactj (closed onto which the switch member may be moved) the wire 14: extends to connection with the binding-postal, and from this latter binding-post the wire 15 extends to connect with the metallic base f of the upright or riser E. From the binding-post 'm, which is 011 the same plate or metallic base B as the binding-post a, an electric wire 16 extends to connection with the other pole of the battery Gr. When the switch is closed, partsj and j rendering the wires 14 and 14 continuous,and temperature changes above or below the normal are such as to cause the deflection of the thermostat-bar, so that the metallic portion Ct thereof is in contact with either of the contact-screws it or W, the current from the battery will by the circuit then closed pass from wire 16 to binding-postm, across the metallic base, to and through the U-shaped upright C, thence along the metallic strip a to and through the upright E, with which wire 15 is connected, and through said wire to the binding-post n, thence by wire 14: through the closed sWitch and wire 14, to and through the electromagnet of the circuit making andbreaking buzzer, and back by wire 10 from the latter to the battery.

I make no claim to the construction of the audible electrically-actuatcd indicator, and in place thereof, manifestly, the most common form of alarm-bell might be employed.

WVhe'n the apparatus is desired to be inactive, as on an occasion when no alarm in the apartment is desired, the switch may be left open, as indicated in Fig. 1, whereby no temperature changes will result in closing the circuit, and consequently the battery will not become run down or exhausted.

It is very convenient and satisfactory to have the battery G or a series of batteries, properly connected, inclosed in the box or cabinet A on the cover of which the principal parts of the apparatus which have been described at length are mounted.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

In an electric temperatureindicator, in combination, the metallic base-plateB having a U shape as shown, a thermostat-bar D, the extremity of which rests on the top member of said support 0, the screw t' passing through the thermostat-bar and loosely through the top member of the support and with a screw engagement into the bottom member, the upright or riser having the base thereof supported by, but insulated from, the base-plate B, and having the U-shaped extremity j" provided with the adjustable contact-screws 7t and 7L2 threading through opposite portions of said part f, and between theendsol which the extremity of the thermostat-bar is extended, circuit connections normally open and adapted to be closed by the movement of the bar against one of said contact-screws, having connected therein a battery and an electromagnetic audible signaling device, substantially as described.

Signed by me at Springfield, lllassat'ahusetts, this 13th day of December, 1899.

LESLIE S. \VILDER.

Witnesses:

WM. S. BELLows, A. W. SMITH. 

